Screening machine



Sept. 18 1923. I 1,468,005

E J. A. coYLE ET A1.

SCREENING MACHINE Filed Jan. 30 1922 2 Sheets-Sheet l JOJG 7A. Q7 .e

Sept. 18 1923. 1,468,005

` J. A. coYLE ET Al.

SCREENING MACHINE Filed Jan. 30 1922 2 Sheets-Shen?. 2

UUGJQZP fase A. @o je 2011/65 ff. ZQ l?? {50h/450111295 Patented Sept. 1,78, 1923.

,TED-grrr JOSEPH A. COYLE AND VCHAIR-LES H. ROTH, OF BIINNEAPOLIS, MINNESOTA.

SCREENING MACHINE.

' Appli-cation filed January 30, 1922. Serial No. 532,824.

To all whom t may concern Be it known that we, JosEri-r A. loYLn and CHARLES H. ROTH, citizens of theUnited tetes, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful improvements in Screening Machines; and we do hereby declare the following to be a full, clear, and exactvdescription oil the invention, suchas will enable others skilled in the art to which it appertains to make and use the same. i i, Y

Our present invention relates to improve-A ments in screening machines of the type dis closed in our S. Letters Patent #1,219,925, issued October 28, 1919, and has'for its ohject to improve the same in' the several par ticulars hereinafter noted.

To the above end, the invention consists of the novel devices and combinations of de# vices hereinafter described and definedl in the claims. Y l Y In the accompanying drawings, which illustrate the invention, like characters indicate like Vparts throughout" the several views,

Referring to the drawings Fig. 1 is afperspective view of the improved screening machine;

Fig. 2 is a side elevation of the same;

Fig. 3 is a transverse section taken on the line 3--3 of Fig. 2; i

Fig. 4 is a side `elevation of one of the eccentrics and applied connecting rods;

Fig. 5 is a detail view with some parts sectioned on the line 5-5 ot Fig. 4;

Fig. 6 is a side elevation of one ot the upper and lower rocker arms;

Fig. 7 is a detailview partly in section, taken on-'the line 7 7 of Fig. 1, onvan. enlarged scale; p

Figs. 8 and 9 are detail views in section,

`taken on the lines 8-S and 9-9, respectively,

of Fig. 7 Y

Fig. 1() is a detail view, partly in eievation and partly in section, taken on the line 10-4-10 of Fig.1; v Y l p Fig. 11 is a detail view in section, taken i on the linel 11-T11 ot Fig., 10`on an., enlarged scale; and

Fig 12 is a perspective view ot one .of the front bearingvbrackets. f

The numeral 13 indicates a rectangular base built up of commercial I andchannel Vbars rigidly connected; A Front, intermediate and rear bearing brackets'14, 15 and 16, re-

spectively, are supported on the side members of the base 18 and rigidly bolted thereto.

Journaled in the front bearings 14 is a driving shaft 17, to one end of which is keyed, outward of the respective bearing 14, a combined driving pulley and iiyswheel over which runs a belt, not shown. shafts 19 are journaled in the pairs of bearings 15 and 16, respectively,- and have rigidly secured thereto, inward of said bearings, upper and lower pairs of rocker arms 20 and 21, respectively. A

Each pair of upper and lower rocker arms 20 and 21 is integrally formed with a common hub 22, keyed or otherwise rigidly secured to the respective rock shaft 19. Bearings 23 and 24 are formed in the outer ends of the arms 20 and 21, respectively. Referring to Fig. 6, it is important to note that the operative length of the upper rocker arms 20 is slightly greater than that ot the lower rocker` arms 21 andy that said upper rocker arms are rearwardly inclined, or in other words,` the axes of the` bearings 23 are set back of projected lines which extend through the axeskot the rock shafts 19 and hearings 24. lt is also important to note that the upper rocker arms 2O and their bearings 23 are inset in respect to the lower rocker arms 21 and the hubs 22.

An yupper sieve frame 25 is carried by the upper rocker arms 2,0, and a lower sieve trame is carried by the lower rocker arms 21. Each sieve .trame 25 and 26 includes a pair of channel side bars, the 4flanges otwhich are turned outward and have rigidly secured thereto, sieves 27 and 28, respectively, and which sieves are vertically spaced, the one above the other, and have a ends by members 30, and which members extend to the `upper edges of the retaining iianges 29 to prevent `materials on the upper Vsieves 27 and 2S from working over the rear ends thereof As best shown in Fig. 3, the sieves 27 areconsiderablynarrower than the sieves 28 and materials screened therethrough are deposited on the upper sieve 28 considerably inward of the longitudinal Rock trames 25 andV 26 are` closed at their rear edges thereof toe-preventwashing over the sides thereof. Y Y Y To support the sieve frames 257and 26 from the rocker arms 2O and 21, there is rigidly secured to the channel side members of said frames between the flanges thereof, front and rear bearing vblocks 31 and 32. respectively. These bearing blocks 31 and 32 have bossed bores in which are mounted,

Ywrist pins 33 rigidly Secued for the Webs of the. channels of the side members of the screen frames and 26, by forming thereon, reduced screwfthreaded` studs 34 which extend through bores in said webs and have v nuts 35 applied thereto.

Bushings 36 are secured in theV bearings 23 and' 24, mounted on the wrist pins 33 and have on their inner ends, external an# nular flanges 37 which are interposed be'-V tween the hearings 23 and E24 and the bosses on the bearing blocks 31 and 32. To eX- clude dustl from the wrist pins 33, the outer endsl of the bushings 36am closed and pa'clrings 38 are mounted in annular" channels 39 in the flanges 37 and bear directly against said wrist pins. Circumferentially spaced oil grooves 40 formed in the bushings 36 extend to the packings 38. p e

.To reciprocate with said frames 25 and 26:, there is mounted in thedriving shaft 17 secured for rotation therewith, inner and outer pairs of eccentrics 41, set, each pair, 180 degreesapart. Eccentric straps 42"are mounted on the eccentrics41 and i have secured thereto, connecting rods 43 whichare attached to the sieve frames 25 and 26. These connecting rods 43 have on their opposite ends, from the eccentric straps 42, bearing heads 44 provided withlbushings 45 mountedon the wrist pins 46e and provided with circumferentially spaced oil grooves. The wristpins 46 are secured to arms 47, integral with the for'-V vward ends of the bearing blocks 31, and it is impor-tant to note that the wrist pins 46 are all "located in the same plane. The wrist pins 46 are secured tothe arms 47 by formingr thereon, studs 4S which extend through bores in the arms 47 and to which, nuts 49 are applied. Y

The'bcaring heads 44 and. theirl bushings v45 arerheld on wrist pins' 46 between the arms 47 and heads 50 on the outer ends of said Wrist pins,.and which arms and heads Vprevent dust from getting to the wrist pins f 46. To. prevent lateralinovement of Vthe eccentric straps 42 on'the eccentrics 41, said eccentric straps and eccentrics are provided the latter with externall annular tongues 51 whichworlr in annular' channels 52 in the former. The sidesof the eccentrics 41 and their stra-ps V42 are' thus` leftfiush so `that there is no chance for dust, dirt and the like to lodge thereon and finally work be- ,tweenv the moving parts.

that the major travel ofthe rocker arms 204 is rearward of vertical lines which entendV through the axes of the' roclrshafts 19, andV that theV major travel of the` lower rocker arms 21V is forward of said lines. This travel may be'varied, at will,*b`y changingV the operative length'of the connecting rods so f 43 tothe upper sieve'frame'in respect to the operative lengthofthe connecting Vrods'Y 43 to the lower, seve'frariiesV 26.1

The operation of theimproved screening Y machine may be' briefly described Vas follows: Y

Materials to be-separatedV or graded, are deposited on the upper screfenv-27 by any suitable means". All materials that'will not pass through the screens and bedeposited on. the nextunderlying screen, are precipitated over the front ends thereof. rI `o"cause the materials inthe screens` to travel toward the forwarder delivery ends of thescreens, the same Vis jumped or bounced by 'the upward and'forward movement of thesc'reens;

By rearwardlyl inclining 'the upper rocker arms 2O in respect to lines extended through the aries of the rock shaft 19 and the bearings 24 and stopping their forward movement at substantially thehi-ghest point, a

greater jump or' bounceis imparted to the U, l i) materials on the upper sieve's` 27, and, hence, said materials are moved faster over said sieve lto theV- delivery end thereof, than the materials on the lower sieve 28. Thisl greater lifting movement'of the upper sieves also dislodges largepiecesof materials held in said sieves and prevents the same from* clogging, and, hence, slowing up Vthe action of the machine.

successful operation vofthe machine.V To cause vall'of the sieves to 'have the samelength of horizont-al travel, it is necessary to increase vthe operativelengths of the upper rocker arms over that Vof the lower rocker arms to offset the decreased hori- 25 and 26but maintain positions', close in` The movement of the ina-1 terlals on the `lower sievesis more of a sift ing` action, which is highly desirableV in the lZonta-l movement ofsaid upperrocker arms produced by rearwardlyjinclining the same, `in'respectto the lowerroclzer arms. Y

' It is important to note that the wrist pins .46 oscillate Vwith thesieve-equipped framesV the vicinity ofaA common plane thatinten e,

sects the axes ofy thedriving shaft 171 and i' Y the rock Vshafts 19. This :oscillation of the.

istV

`wrist pins eidwhile very slight and does not deviate very muchv from a common Y planethat intersects the axes of the driving plane, by thus locating the wrist pins 46 a straight pull and push on the sieve frames and 26 by the connecting rods 43. without any angular pulling` or pushing move-Y ment, and, hence, movement 1s imparted to the screens without any strains or undue wear in the several parts of the'machine.` The mounting of the sieve frames issuch that when the upper frame is traveling backward, it is vdriving the lower frame forward by means of the rocker arms, and,.hence, the sudden stopping of one screen frame is cushioned by the forward movement of the other sieve, or, in other words, the two screen frames Vare balanced, the one against the other. This balanced action of the screen frames, eliminates all bumps, jars and vibrations and the parts of the machine are so arranged and constructed by protecting all wearing parts from dust, dirt and grit which is prevalent in materials handled by this class of machines.

The above described machine has been put Yto extensive commercial use and has proven highly efficient for the purpose had in view.

What we claim is l. The combination with a rock shaft, of upwardly and downwardly extended rocker arms on the rock shaft, upper and lower sieve-equipped frames carried, respectively, by the upwardly and downwardly extended rocker arms, a driving shaft having cranks set one ahead of the other, and connecting rods operated by the cranks and connected by independent pivots, the oneto the upper sieve-equipped frame and the other to the lower sieve-equipped frame, said pivots being arranged to oscillate the sievefequipped frames but to maintain positions closely in the vicinity of a common plane that inter sects the axes of the rock shaft and the driving shaft,

2. The combination with rock shafts, of upwardly and downwardly extended rocker arms on the rock shafts, upper and lower sieve-equipped frames carried, respectively, by the upwardly and downwardly extended rocker arms, a driving shaft having cranks set one ahead of the other, and connecting rods operated by the cranks and connected by Vindependent pivots, the one to the up-v per sieve-equipped frame and the other to the lower'sieve-equipped frame, said pivots being arranged to oscillate the sieve-equipped frames but to maintain positions closely in the vicinity of a common plane that intersects the axes of the rock shafts and the driving shaft.

a free reciprocatoryv The combination with rock shafts, of upwardly and downwardly extended rocker arms on the rock shafts, upper and lower frames carried, respectively, by the upwardly and downwardly extended rocker arms, a driving shaft having cranks set one ahead ofthe other, each of said frames having a plurality of sieves, which, at their delivery ends, are progressively shorter from the uppermost down, and connecting rods operated Vby the cranks and connected by independent pivots,the one to the upper frame and the other to the lower frame, said pivots being arranged to oscillate with the frames but to maintain positions closely in the vicinity of a common plane that intersects the axes of the rock shafts and the driving shaft.

4:. The combination with rock shafts, of upper and lower rocker arms on the rock shafts, sieve-equipped frames carried by the rocker arms, said upper rocker arms being inclined in respect to lines projected through Y thev axes of the rock shafts and the connections between the lower rocker arms and the lower sieve-equipped frame and in respect to the direction of travel of the material on the sieves, and means for oscillating the rock shafts tovcause the rocker arms to impart opposite reciprocatory movement to the sieve-equipped arms.

5. The combination with rock shafts, of upper and lower rocker arms on the rock shafts, sieve-equipped frames carried by the rocker arms, said upper rocker arms being inclined in respect to lines projected through the axes of the rock shafts and the connections between the lower rocker arms and the vlower sieve-equipped frame and in respect to the direction of travel of the material on the sieves, the operative length of the lupper rocker arms being greater than of the lower rocker arms, andmeans for oscillating the vrock shafts to cause the rocker arms to impart opposite reciprocatory movement to the sieve-equipped arms. 6. The combination with a rock shaft, of upper and lower rocker arms on the rock shaft, sieve-equipped frames mounted on the rocker arms, and means for oscillating the rock shaft to cause the rocker'arms to impart opposite reciprocatory movement to the sieve-equipped arms, the major travel of the upper and lower rocker arms being on opposite sides of a vertical line extending through the axis of the rock shaft.

7. The combination with a rock shaft, of upper and lower rockerV arms on the rock Lshaft, sieve-equipped frames mounted on the rocker arms, the operative length of the upper rocker arms being'greater than of the lower rocker arms, and means for oscillating the rock shaft to cause the rocker arms to impart opposite reciprocatory movement to theAsieve-equipped arms, the

major travelY of the upper and lower rocker arms being on opposite sides ofa verticali .lineextending through the aXis of the rock i in shaft. Y Y

8. The combination with a rock shaft, ofV

Vupper and lower rocker arms oiivthe rocky shaft, sieve-equipp'edV frames mounted on jected through the axes of the rockshaft- Vcatory and the connections between the lower rocher arms and the lower sieve-equipped frame and in respect to the direction of travel fof the material onthe'sieves, anc means for oscillating the rock shaft to cause the rocker arms to impart opposite recipromovement to the* sieveequipped arms, the major travel of the' upper and lower rocker arms being on opposite sides of a vertical'line extending through thel axis of the rock shaft.

9. The combination with a rock shaft, of upwardly and downwardlyextended rocker arms on the rock shaft, sieve-eq-ui'aped frames carried by the rocker arms, oppositely extended bearingarnis on the sieve-equipped frames, and operating connectionsV connected by independent pivots to the bearing arms `and arranged to oscillate with the sieveequipped frames but to maintainV positions closely in the vicinity of a common plane that intersects the axes of the rock shaft and the driving shaft. s Y

l0. The combination with a rock shaft, of upwardly and downwardly extended rocker arms on'the roclisliaft, upper and lower sieve-equipped frames carried, respectively, by the upwardly and downwardly extended Y rocher arms, bearing blocks on the sieveequipped Vframes and having wrist pins mounted in the rocker arms, oppositely eX- tended arms on the bea-ring blocks andl having wrist pins, and operating connect-ions attached to the last mentioned wrist pins for oscillating said pins and including a` driving shaft, said last noted wrist pins being arranged to oscillate Vwith saidV sieveequi'ppe'd frames but to maintain positions close in Vthe vicinity of a .commonplane thatintersects the axes of the rock sliaftfaiidgthe.Y driving shaft. n

VVl1, The combination' with a rocker. arm-V equipped'shaft, of a sieve-equipped` fi'amc having bearings provided with wrist pins,

bushings closed at their outer ends, secured Vinthe Vrocker arms and applied overV the wrist pins, and means for oscillating the sieve-equipped frame.

l2. The combination with a rocker armbushings closedat their outerends,y and-hav-v ingpackings Vat their' inner' ends,V secured in the rocker arms and applied over the wristVV pins, and means for oscillating YVthe sieve,-

-equipped frame.

1.3. YThe combination with a rocker' armequipped shaft, of a sieve-equipped frame having bearings provided with wrist pins,

bushings closed at their outer ends,s'ecured in the rocker ajrms and applied over theV Vwrist pins, an annular external flange on the bushings interposed between said" bearing-s and rocker arms, and meansffor oscillating` the' sieve-equipped frame.-

lel. The combination with arrocler arinequipped sliaft,.of a sieve-'equipped frame having bearings Vprovided withrwrist pins, bushings closed' at their outer ends, secured in the rocker, arms and applied over f the wrist pins, an"v annular external flangefonV and rocker arms, annular channels in said flanges, packings in `the said channels and engagingthe wrist `pinsfoil grooves in the bushingsV leading toV said: pack-ings, and means foroscillatiiig tlie- Vsieve-equipped frames. Y. 1 Y

16. The combination with afrocker armequipped shaft,'of a sieve-equippedframe having bearing arms provided with wrist pins, said wrist pinsV having heads 'on their outer ends, andconnectfing rodsf attached to theV wrist Apins between said-bearingarms and the heads on the wrist pins.

17. VThe combination witha rock` shaft, of rocker arms on the rock shaft, upper-fand lower sieve-equipped frames carried the rocker arms, a driving shaft fhaving al Vplurality of eccentrics equippeclwith eccentric straps, said eccentrics and' eccentric :straps .having tongue and groove; intericchi-ngen gageinent, `and connecting rods-betweeny the sieve-equipped frames and the eccentric straps. Y v Y In testimony'whereof we alliX our' signa- 

